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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e3b0d564345f0077259680e69f54224e8c6fde7f44a15f16494de68617e50c' 
  AND token = 'd1fKsbscy4YakMlqTv9SNNcBxA58cFGfM6IznqD5+qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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