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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e744d0491d0b8a3747d696fe3c38644ab5af5a400e2ea487e5cea051f5ade673' 
  AND token = 'z3JfTU3L06ihfTyQC1xx8/uB74kQc0bliMQh/NqgHw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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