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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f58d5b11c80c8da0924b46947f57cbba312b715ca8fb5d11c993bbc6296a5d' 
  AND token = 'aBtPdHY1oVH5qZQwc2cgJv9dSxECi0s3AyJ3nKpwMUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}