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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c62aa1d38aa1972f065eb041f075a1be1307d4c4982f9d5ac82a93811f8ae1' 
  AND token = 'h+M9MasGys7sxp+l8dTWHLIKnoyTGY20Br4q/x2sX6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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