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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5622b9a352c4107caa87e73b8f77e18da24941f2aae143d64a362bc828689187' 
  AND token = 'y6jdq+u62wTqWxztmspMKvjN0uiq1CxyEt02FQp6x/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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