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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9039c45d97a0955306caeca452ba094a6175abc56a304a23dc01aca817c77d' 
  AND token = '+8SqSHBRnHZ4VtWys7BdzQ22SRhkWua1rf+uImvDBp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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