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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a54b30f5b0086c195385c332c26de419d8c6412dbeafb614a0960ab10980e58' 
  AND token = '0atu6l6JqWCyqP3GKy5c4jhM+olSXy2GwwV+QUm4nKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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