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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e810881a5baf37690ee613f7372c61489b767786471dedbb638d0e8d1563819d' 
  AND token = 'J+PRIwtR5nkxQ4BNvL0l/vuBv7XeqoPbIXK491JPcsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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