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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87d524d84d5613fbd4188cf66c356b196494cdb5c76b9f45e1b0bb22cd240f8' 
  AND token = 'HCnUaUpRI1K+80fxLkUCTyXY7l322HfY2Jr3lYXYWbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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