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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c1486f4dfdef13ca5485f6c6fa89ebe82b1b52d77de2f4b5de752ee0fd4b7a' 
  AND token = 'ljCHqK/kgaMMKjuTs2WJ7tIMnsrZRNNkloxAcBXljc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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