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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa985896b469bcdf1e62967f543636be3b14b62186676336de6ba7c656fc103b' 
  AND token = 'HskMBR3Lqi9z3qLxU42f45zvCeNTatXQla1QAaD0+wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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