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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd97e2459e5e1ae4f428360ca2ad9650acece3852b27dac7fd1cc5c6dd121d8c' 
  AND token = 'IJ9N1vKGW/FS0tC15qs3bwF0YnuA4uiwdB5LcAtrBko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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