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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b86abbe2f3678242b1769d334a7c61e35c0a859a780c7e905dc4a071d0b2fe' 
  AND token = 'pkuDPmjQtYa5BKIRz1csrlTEWS8o91YpalOpfzvLgcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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