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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b65b4ac64d046d13ce2f65a31a35106b9597d2e9abad58f7fd301ccfd57f0b2' 
  AND token = 'v5/MTKZFEOC9SaMGz3+7XTXZiEfUZe6CUEZG+PatAAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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