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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f286a1a953566c466c874e44dc51e5da9a7ecf06969eaff152486837eb4aa95d' 
  AND token = 'Cfb9JZQjupDyN0gf+5d02B0/OXrDqXc7fd0Mboo0VTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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