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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690e96a7ab15577bc2c0491a91f1edaf1d22b9b457fc88d36959069b517d0a2e' 
  AND token = '+RcWeHhNIBH4ISaWixA+NMwe14cuwVYil7n1ME2qpFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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