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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c157fccb652810c4574ee69ee4c05f02f6181394fc44e0d78aa51e323498e26' 
  AND token = 'aa9CSkQnYSbHe/pwD+tm21Ne+op86KlSfoq1tAGPr94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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