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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97670a68c5bcb8bb59c9af391bcf8ac1cd2ce14678a1facf07799cc14df17094' 
  AND token = '+BR68FbqzvSGc78+VRAzIkZLu8sQDSO0nWAl6A2rkpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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