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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fadacdd0f4a72121d6a290dddcd6af4eed4b8d1bf39659562ebddc4e6805a1f' 
  AND token = '5rSTj4RMSqNiREVdPw05eR7GllAhTmQpZc1dfeiCvaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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