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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c23e2adde4223e873a7a01dad4d78532681095036b82a55eb0b924cb98995c' 
  AND token = 'flr2/b7SjsCa8ilpC2LzoUDAK8rTLFCG9yK9uRTOFeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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