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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bf31fe222c83afbfecd0b99a47b610db6e59361ef3cd9495602a334e0e8fde' 
  AND token = 'UwHdBIrAigupZfbhaXLlB/vHIZfQ9skJ46zXv2rovOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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