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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70c2b77a3b8ab87d8581ba74e33e2d55a44296ff446d0617486965a534dd748' 
  AND token = 'jgGEjGPsNwyObg0R2NzekDkMi/MMDo+dGEctpR85sbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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