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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720927eeb1ddc39d732f9c6e76737f95b84a09ded398faaaf03c178221070629' 
  AND token = 'XEg86oOlhTruWuIfb5h8WPGgx4fgN6g6Uu4NDyzf2cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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