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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d9833350c6c0120af0e3d0ce21d2c14c29ac95a2906ff4b7c56dfdb43e2814' 
  AND token = 'cba/0amg3tWfUJuZ8uDYd9UyiUDD0A6Orykhm3SO10s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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