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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70044301e19e60dd928060744ec11bd03baeb2cdaf4ce17401465164d6df515' 
  AND token = '8+3ce57XdVVkU3515RBD+/p/74nyS1+R0u37OZM0xoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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