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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082eee686e62139d26d21efc1bf29726e23b31c5db8c7c569e969ee305a1f420' 
  AND token = 'TpwYM8HQ2X2/2HCBuuR3vSdwlrU72J3IW53uhq8+9eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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