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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e816e90ca43b5aebceec610a7c945bbe490dcfb488d5b98d29efc27761e0ff0' 
  AND token = 'JHBUbXoK2Cb4+mApXJwZ57DhnKNB1+Rife/ph27yYIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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