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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e6d76b066b0d148ec4299d38777c145ad0ddda5c6bf7071ae4a54a8584aa01' 
  AND token = '2MFw8h5YJk8zvCrkAEVZrNSw3EllJouhHiepJ2wxgKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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