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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3082a9f1c45195d08640f5c70029f445ffba25e1791038a290de2f096c3fa7' 
  AND token = 'hB60T7UeHDVZMF92T1I1ztohtGo2Uv3yzAE6wAPfrGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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