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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8564a0bab0ea70de33c6d7c8464e7bf6324f21317e3f896b049acfc3372b7cc' 
  AND token = 'cKmSjBmBM01R60b4t8ZgnNZGhSRbS6ULNNfN097b0ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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