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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2bac5f7a7223baad6cb3da01b2da0b7e14ca80f34b2281648013fb503aa443' 
  AND token = '9M3xDUX5dUyrJYESYblU5UoD91IUwHdKmkE/LkFPZN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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