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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2978c2342fd0ed95952e08ef562860552c89ed655055eb35cd18d2d2861659e' 
  AND token = 'O5fjvo6z49M1ar+xZiNNu3POKnXI3l7TF1FZmqqVxtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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