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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dbd881d4cc0f4859cc4a3505a6ec3826e0d7422f5aea9204c8e3c606c9cfed' 
  AND token = 'EHWi2yYiMdZ+2DLGUhfDPOd6hsQGu0oDLqkbwKDRaLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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