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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a5a4ac0ae6bab783103911cc290fe8b6ae6379bc13a037b161b3a6f943194b' 
  AND token = '5qycfh7dZOZLp9rZBqmHqKNe/bzf1o/r8AmKruzItFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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