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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f9e542609fd56e3ae27cb2d7a36d37e60a9bf6572905056a1aecf5617b0164' 
  AND token = 'oeShu4M6iqT8w/xZXhBOIs/BpPJo9rw4AC9zfX1g+ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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