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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9f202c625a529dca8f6a2ae15392ff524de16c88c276d5130363c6e62d9a57' 
  AND token = 'Ui+kMbAkYZ29z/ezYmMNlRBUUg1sphLaNplt5MStU/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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