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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce1a5af2928b2f6f4c8fcda8aecd469ec8606581ebe8d473d9b1479ac53e6a2' 
  AND token = 'e1dV0EG2LZyrEWe9gJDvwNfqTh5XYfVkTMb+aKU8J7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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