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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0cfa813297a71a34f056ff2450cd96d28e65efc3f8acb8ff490beb34402d7b' 
  AND token = 'mag0Bk051n3KW9AfobeqFnAY8m8ZKSEFE6HMIW0gsVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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