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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8845f755ad2e7c1d505fb7627fd6ad402bd5ce646b828a64504cae02fa404778' 
  AND token = 'mgriyUTWpFxIR4q04AmQ0H8knqf9tMjVGS85Y8JHysg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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