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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ce71c2928d2462db32806a753fd7cbfd915b5989bcb1b3e26a753807f98a36' 
  AND token = 'Ubet+jVVh99OP+GnBG8sFr3V0cIELWr8QyDr0n+ay70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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