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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75a768290e068e6f04dccbf41577e906ed767dd17d4cae0708ea63b2b5f9ecd' 
  AND token = 'WGJhsoIhPff6Jfy7PTDapdq8284pqB8lrKwX/DzSy5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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