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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c0a42e484de330b22f3e907ad334379240dbcc8db0b8690d4bc3116da077c4' 
  AND token = 'qAhGl3Jipgc8D2lrKSQa7QhbOBhnJZJGRU+yPbifz6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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