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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bd53fef376e8d2a3baf52e4eea7e9b8a0ee8b89da5777ed2ef3626f7df8495' 
  AND token = 'cHiwtb0x1Xvb7ibG5GcMF/Yt8SKoVj+aLhxwMxq2xnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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