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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a90f07042811d4bab9cf59458580d3849b5c4aecc44f168c7d81e154135e2b' 
  AND token = 'Xeg+1NgHyJR7uONOl9MO7l3Q7e/1AzYv51XJL8hV8I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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