SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c014caab34f97bdebc1f562207381541291f0a763f622d52a94af857e2c88a10' 
  AND token = 'UYuZtYN1NGgWpbJzyJF1h0/R1q7H/PFqq3+Lm69v7y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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