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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027f371138a7250a6d27ae0ceb90f8502d3c5396148718aa5c14dc0985f42a69' 
  AND token = 'nx3UpnTI/2N8PV9Pb4gvXQJjnHtwx5Bd9tKE2OOosko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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