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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc3ce567097e78be43f107f25be71bab2f3ce762f1390ba24648a3eced33480' 
  AND token = 'qeohxK9/iKzTGi0OhzISPH3QpHG8eplW+niA+f4ukyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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