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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4226eb69183e3a4ea2d5967d783f7ea63cd982f3b850bd349f9b921b18daa37d' 
  AND token = 'BH5SmHOJI0YTeo8dILR1/mjOLHyLNyvWes3/Abw+Z9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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