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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571ce58a55f8e7324fcb1f2a20241f06df4627e45e5de09123df52892c5f9464' 
  AND token = 'rwey4Io3cbWBcIg7b0Y2hYZFCB3mXoBpXImzPw4+A50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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