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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cc40cfee19127de3b2da93a2286febf11d4c419853aa07d19b1e2caba83b38' 
  AND token = 'gs8j9QoB/eSMIHGYjPW3cPrEPHBAVzp01hA613nMUco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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