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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec1f6ec7d78216462525ff253186967959997ea9a0db5ad5f54ca39d9d37d4f' 
  AND token = 'zGsLIvE8eNZdjIOGwTEEnYtYTS/TH+XyP4X21kRfSL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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