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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243009a70a3f04530de6cb698a1c1d02ca17c247d287dd08ae737372ccb0f50e' 
  AND token = '8O8T8fy0hYgEWtxmcP1j9eNcn78lMfOljFYAgwTJ46g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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