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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef29818d11df8c6af1222e37170175f6af4a64d38321076cde4f7a5c2368713b' 
  AND token = '8df4VwGGNQA0LMoSNWHqySS2O86GhVUW+Hoy9gywV5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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