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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5c0248799246f277022bba356a10d68eeeeed1d85ec78d0adfdf55ae3ddac5' 
  AND token = 'bovSDqM/IKnB+E1fsqc/yGUi5MDX6GYrHDJ+aiiehPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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