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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc58130351e346537a82e167ff5492dfd7f50817fdf0e94242e962eb51e4f5f' 
  AND token = 'AZx/9TZ3VzQtkTm+GeevQ5upoykm8YJbdllAgTqmItc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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