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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d1ea06d200b0a912cdee27c295f942bc1018f15e7298ab9b7acd158db27ec7' 
  AND token = 'VD6t+lfj6L6b7OmtlglWfSfoz/P8BF8nTTQj+6tcJ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00210

JSON explain

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