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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0c31e001c5d3c4f661d41d305060b1d21479ef41f6adfd5948654690430b87' 
  AND token = 'nhk30atg4Kbae9TPArtNi0Vkuerp8hcABZeX95heyrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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