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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0522788b5ae07b198f0571c80487e5655ccd4f71ac751ea4c008d829c44538a6' 
  AND token = '20SUcTTz0WzSjoRWC7XGePs6ai8zl4XRSzzCjnkEdLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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