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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54be541eef354873f6e967ca205c165e2b2d522f60a3dd43254ca6a1267a382d' 
  AND token = 'n5f42tcvgSyY6yeg2sq3s+e1cMxUloieKcqblGYpB10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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