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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ba00e1d8685e1465a19834249e5c441eb6d78db2d0dd0d89b6f22fff9f7ba6' 
  AND token = 'H7VrPc8L2xZELH4letZ6rssOKHaitSAXXnfex28TUH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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