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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae03f9b0b2283f0aebd0eac92c7389692d5046e7e0cc0ae784abd3c44cc794f2' 
  AND token = 'K7p1yzg8+ZyP/7k4moCV53v63I2cHVqbQHsza9nTtW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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